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Author Topic:   Sump Drain Plugs
Feejer posted 03-27-2007 04:24 PM ET (US)   Profile for Feejer   Send Email to Feejer  
I'm going to look at [a 2005 Boston Whaler MONTAUK] this Saturday. I figured I would download the online manual and read up about what I'm looking at. One thing has me confused, and that is this part in the manual that reads, "When moored the sump drain plug can be removed to allow any standing water to be drained overboard. It is normal for some water to enter the sump". Is this thing acting like a scupper? And why can't I remove it when the boat is running?


swist posted 03-27-2007 05:17 PM ET (US)     Profile for swist  Send Email to swist     
It is not a scupper - it is below water level. Water will enter the boat, not leave it, if you pull the plug while at rest. But the boat floats so high that very little comes in. If there is a lot of water in the boat, most but not all of it will drain out if you pull the plug. It's just trying to seek its own level with the water on the outside of the boat.
Feejer posted 03-27-2007 05:47 PM ET (US)     Profile for Feejer  Send Email to Feejer     
Don't fully understand the purpose, but thanks for the anwser.
nydealer posted 03-27-2007 09:46 PM ET (US)     Profile for nydealer  Send Email to nydealer     
Its like leaving your drain open on a bath tub when you shower. If the boat is left in the water is is self bailing. Under it's own weight the boat will drain. When you step in with gear it will take on some water so you put the plug in when you use the boat. If you keep the boat in the water uncoverd with the plug in, it can fill up with water if the auto bilge pump is not working or battery has gone dead.
Feejer posted 03-28-2007 06:25 AM ET (US)     Profile for Feejer  Send Email to Feejer     
So it is self bailing to a certain degree


Newtauk1 posted 03-30-2007 11:49 PM ET (US)     Profile for Newtauk1  Send Email to Newtauk1     
Exactly. As mentioned, if your pump fails during a rain storm the boat will self bail most of the water out. Great back up for peace of mind when away from your slip or mooring for any time.
swist posted 03-31-2007 06:36 AM ET (US)     Profile for swist  Send Email to swist     
But, I would also mention that it is the experience of myself and several other CW members who moor their Montauks in saltwater, and don't want salt inside the boat, that the bilge pump does a fine job of emptying the sump over extended periods. Obviously your battery has to be in good condition, but we had a huge amount of rain last Spring/Summer and I never noticed even a minor drop in battery power after the boat sat all week getting poured on. Yes you are running a little more risk with this system, but crud and debris can block the drain hole too, even with the plug out.
pshedberg posted 07-21-2009 10:37 AM ET (US)     Profile for pshedberg  Send Email to pshedberg     
Can I use this feature to guess whether there is water in the hull? When I full the plug out of my 1986 11' Standard Whaler, a little water comes in, but not much. Is that normal?

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